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  1. #include <iostream>
  2.  
  3. class A {
  4. public:
  5.     virtual int a1() = 0;
  6.     int a2() {
  7.         return a3();
  8.     }
  9. protected:
  10.     int a3() {
  11.         return a1();
  12.     }
  13. };
  14.  
  15. class B : public A {
  16. public:
  17.     virtual int a1() {
  18.         return 1;
  19.     }
  20. };
  21.  
  22. int main() {
  23.     B b_obj;
  24.     int value1 = b_obj.a2(); // This fails for OP.
  25.     std::cout << value1 << std::endl;
  26.     return 0;
  27. }
Success #stdin #stdout 0s 3340KB
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https://ideone.com/mIbNbs
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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